我想知道是否有任何方法可以延迟函数的返回语句......例如：

func returnlate() -> String {
    var thisStringshouldbereturned = "Wrong"
    DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
        // Here should be the String changed
        thisStringshouldbereturned = "right"
    }
    // The Return-Statement returns the First Value ("Wrong")
    // Is there a way to delay the return Statement?
    // Because you can't use 'DispatchQueue.main.asyncAfter(deadline: .now() + 1)'
    return thisStringshouldbereturned
}

谢谢，祝你有美好的一天，保持健康。

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回答

                            /// closure here!
func returnLate(completion: @escaping ((String) -> Void)) {
    var string = "Wrong"
    DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
        string = "right"
        completion(string) /// similar to `return string`
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    returnLate { string in
        print("String is (string)") /// String is right
    }
}